                &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
                &\multicolumn{1}{c}{leakage}&\multicolumn{1}{c}{leakage}&\multicolumn{1}{c}{emissions}&\multicolumn{1}{c}{emissions}\\
\hline
Treatment       &    12.11&    13.10&    35.91&    32.81\\
                &   (6.38)&   (7.37)&  (11.40)&  (10.78)\\
Constant        &     5.92&   -27.62&    35.49&    52.38\\
                &   (1.82)&  (21.98)&   (8.94)&  (52.25)\\
\hline
Controls        &         &        Y&         &        Y\\
\hline R\textsuperscript{2}&     0.03&     0.24&     0.05&     0.12\\
Observations    &       52&       49&       52&       49\\
